Blocking problem of freeway side traffic signs

In order to improve the accurateness that car driver recognizes roadside signs on the inboard driveway of more-lanes freeway, the mathematical model and algorithm to deal with the blocking problem of roadside traffic signs were set up by using driver visiblity disciplinarian, vehicle arrival disciplinarian and probability computation methods, the individual approaches and methods for setting roadside traffic signs in sequence were obtained by the theoretical model, they were how to determine the location of roadside signs, calculate the length of blocking rectangle, calculate the shelter probability and choose the number of roadside signs set in sequence. The simulation result shows that the blocking probability varies from 2.1 ×10^-1 to 9.4×10^-5 when the number of roadside signs set in sequence varies from 1 to 6, the blocking probability exponentially decreases with the number increase that of roadside signs, which indicates that the established models and methods to set roadside traffic signs in sequence are feasible, it can solve the blocking problem of roadside traffic signs on freeway with more lanes. 2 tabs, 7 figs, 10 refs.